I understand you'r frustration. I see it all the time with the T5HO's. The problem is that most people dont really understand the difference in the different lighting choices. Hell, you have to practically be a scientist to figure it out. I hear people say to one person, 4 T5's will let you keep anything, then to a person like yourself "No, 2 wont do you any good". All with similar tank parameters. The truth is that most people want to believe they understand such a complicated subject. So they post up what they believe to be true. It gets read as if it's science and then the confusion snowballs, as that gets past on. Really if people dont know something to be true for themselves, it should be kept to themselves. I myself dont have any experience reef keeping with anything else but T5's. And am still a newbee somewhat myself. Having only being involved in it for1 1/2 yearas now. I hear things like "8 will melt softies but with 6 you're all good for anything" Knowing very well that that person has not had an 8 lamp setup to know if thats true. Theres even one person on here who claims to be a T5 expert, but at the time hadnt even owned one until months after making this claim. Then all that was done was to point people to a particular brand of T's with number of lamps they believed they needed. While this information was helpful in pointing people to a decent solution, it hardly constitutes being an expert.
I have an 8 X 39 watt T5HO set up on my 65 reef. It has a single reflector, with workhorse ballasts. It so far has let me keep anything I want. I have accidentally bleached some things out with it. But that goes for any high output setup (like halides VHO's etc.).I didnt light acclimate them properly. It is my belief that if you have a 2 lamp 54 watts T5HO with individual reflectors you are probably equal in light to what you had with the 4 lamp CF. But not an upgrade, You would need 4 to be an upgrade. And then there are those thats say 4 will do anything. You can probably keep quite a few corals with just the 2. Just my .02 worth.